What Are Colored Diamonds?

When most people think of diamonds, they usually think of a sparkling stone that is white in color. What many people do not know is that there are rare and precious diamonds that are colored! And did you know that only 1 in 10,000 diamonds mined in the world have color?

Yellow and White Diamond Bracelet
Yellow and White Diamond Bracelet

Colored diamonds come in a variety of colors, including:

  • Cognac diamonds
  • Brown diamonds
  • Green diamonds
  • Yellow diamonds
  • Pink diamonds
  • Red diamonds
  • Orange diamonds
  • Blue diamonds
Michael Beaudry Pink Diamond Cross Earrings
Michael Beaudry Pink Diamond Cross Earrings

Yellow diamonds are the most common of the colored diamonds, and putting fancy yellow diamonds in engagement rings and other jewelry is becoming more popular.

Fancy Yellow and White Diamond Earrings
Fancy Yellow and White Diamond Earrings

Out of all of the colored diamonds in the world, red diamonds, pink diamonds, and blue diamonds are the rarest.

Which colored diamond is your favorite?

The Omega Speedmaster: A Unique History

Anyone interested in history, space flight or watch making will want to hear the story of the Omega Speedmaster. A little-known specialty watch in the 1950s, the Speedmaster rose to fame as the watch of the Astronauts and sparked a top secret development program with NASA. It is a symbol of the Space Race era that has endured and remains in use today, outlasting even the iconic Apollo rockets and Space Shuttles. This is a brief history of how it all began.

Apollo 7 commander Wally Schirra prepares to enter the attitude chamber during training. July 26, 1968.

The Moon Watch

During the space program in the mid 1960s, NASA sought a chronograph watch that could withstand the rigors of space flight, for the astronauts. It would have to be very accurate even when exposed to many different extreme environments that do not exist on the Earth’s surface. NASA did not have its own development program for watches, so it turned to the commercial sector to find a suitable piece.


The Omega Speedmaster seemed destined to for fame. The first Speedmaster went into space on the arm of Astronaut Wally Schirra in 1962. It was his personal model and he wore it without any endorsement from NASA, as it was still several years before NASA had its own spaceflight certified watch. Between 1963 and 1964, NASA wanted certify a watch for the Apollo missions and was open to many options. NASA directly reached out to several watch manufacturers to submit chronograph watches candidates for testing. Rolex, Hamilton, Logines-Wittenauer and Omega submitted multiple models.
Between October 1964 and March 1965 NASA subjected the candidate watches to these incredible tests:

  1. High temperature: 48 hours at a temperature of 160°F (71°C) followed by 30 minutes at 200°F (93°C).
  2. Low temperature: 4 hours at a temperature of 0°F (-18°C).
  3. Temperature-Pressure: 15 cycles of heating to 160°F (71°C) for 45 minutes, followed by cooling to 0°F (-18°C) for 45 minutes at 10−6 atm.
  4. Relative humidity: 240 hours at temperatures varying between 68°F and 160°F (20°C and 71°C) in a relative humidity of at least 95%.
  5. Oxygen atmosphere: 48 hours in an atmosphere of 100% oxygen at a pressure of 0.35 atm.
  6. Shock: Six shocks of 40 G, each 11 milliseconds in duration, in six different directions.
  7. Acceleration: From 1 G to 7.25 G within 333 seconds, along an axis parallel to the longitudinal spacecraft axis.
  8. Decompression: 90 minutes in a vacuum of 10-6 atm at a temperature of 160°F (71°C) and 30 minutes at 200°F (93°C).
  9. High pressure: 1.6 atm for a minimum period of one hour.
  10. Vibration: Three cycles of 30 minutes of vibration varying from 5 to 2000 Hz
  11. Acoustic noise: 130 DB over a frequency range of 40 to 10,000 Hz, duration 30 minutes.

In the end, only one watch passed the tests: Omega Speedmaster.
With that, the Speedmaster became NASA’s official watch for space exploration, and each astronaut was equipped with one from that point on.
Now here’s a curious piece of history: despite the monumental achievement, the Omega company in Switzerland was completely unaware that their watch had been selected by NASA! This was because NASA procured the watched from the Omega USA subsidiary, which did not inform Omega headquarters of the project. Omega headquarters only found out by seeing a news photograph of the Speedmaster on the arm of Astronaut Ed White, during America’s first space walk in June, 1965 – almost a year after testing had begun!
It was four years later that the Speedmaster cemented its fame. On July 20th, 1969, Neil Armstrong and Buzz Aldrin both wore an Omega Speedmaster as they walked on the moon.

This was an unprecedented achievement for an off-the-shelf watch that had not at all been designed with space flight in mind. It remains part of the official gear issued to NASA Astronauts to this day, making it one of the longest continuous-use equipment items in the space program.

Omega Speedmaster 1960
Buzz Aldrin in LM cabin during translunar coast.

The Alaska Project

A few years after adopting Speedmaster for space missions, NASA and Omega partnered to jointly develop a new version of the Speedmaster, designed from the ground up for space exploration.

The project was undertaken in strict secrecy and code named The Alaska Project. The goal of the project was to make the perfect “space watch,” one resistant to extreme temperatures and solar radiation. Function dictated every design decision, leading to first-time innovations in watch making, as well as interesting aesthetic results.

The Alaska Project Speedmaster result looked very different from the original. It was distinguished by the oversized, red, anodized, aluminum casing (removable). The low thermal conductivity of aluminum protected the watch against extreme temperature fluctuations, high and low, while the red color protected against some wavelengths of solar radiation. The watch case itself was made from titanium – a first-time innovation in watch making. The dial color was changed from black to white, because the white color reflected the maximum amount of solar radiation away from the watch.

Omega produced five Alaska Project prototypes by 1969, but by that time time priorities were changing in the space program. NASA decided the original Speedmaster was fulfilling its role as mission watch sufficiently well, so no Alaska Project Speedmasters were ever ordered into production.

A Unique History
No other watch on Earth has such a unique history, nor had any watch endured such rigorous, independent testing of quality as the Speedmaster.
The irony of the Omega Speedmaster is the original, Earth-designed Speedmaster was adopted for the most important space exploration missions in history, and is still NASA’s official space flight watch, while the Space-designed Speedmaster never left the ground.

Omega Pre-Moon Speedmaster

Collectors today can find many versions of the Omega Speedmaster, from modern models to the vintage “pre-moon” versions of the 1950s – 1960s, including a limited collector’s edition of the Alaska Project.

Rolex: The Timepiece of Achievers, a Proven History of Excellence

Rolex: when any of us hear the word we think of precision, status, quality, and a sense of accomplishment. How did a watch come to be synonymous with such adjectives? Many people know the brand, maybe some of their products, but to know the story is worth the read. Rolex was created by Hans Wilsdorf in 1908, after he had already been in the watch distribution business for a few years. Hans had a vision of a wristwatch with unmatched timekeeping ability with an equally unmatched style, and set out to make his vision a reality. Over the next 100 years, Rolex never let Hans’ vision down. Here is a short narrative of why a Rolex is a Rolex; conquering land, air, and sea.

Two-Tone Rolex Submariner

Rolex was the first wristwatch in the world to receive the Swiss Certificate of Chronometric Precision, granted by the Official Watch Rating Centre in Bienne. The creation by Rolex of the first waterproof and dustproof wristwatch marked a major step forward and was given the name “Oyster.” To gain publicity, a Rolex Oyster was worn by a swimmer crossing the English Channel, arriving on the other side in perfect running order. Rolex invented and patented the world’s first self-winding mechanism with a perpetual rotor, creating the automatic watch. The first expedition to fly over Everest was equipped with Rolex Oysters. The Datejust was the first self-winding wrist chronometer to indicate the date in a window on the dial. Rolex was the first watch to reach the top of Mt. Everest. The Submariner was the first divers watch waterproof to a depth of 100 meters. The GMT-Master was developed to meet the specific needs of airline pilots, assisting with time differences. The Oyster Perpetual Day-Date was the first wristwatch to display not only the date but also the day of the week spelled out in a window on the dial. To assist laboratory scientists, Rolex created the Milgauss, which resists magnetic fields up to 1000 gauss. The third Deep Sea Special was created to withstand the most extreme conditions underwater, achieving a 10,916 meter dive into the Mariana Trench and returning undamaged. A new-generation chronograph, the Cosmograph, soon gained the name that became the mark of an icon: Daytona, designed as the ultimate tool for endurance racing drivers. The Sea-Dweller 4000 is waterproof to a depth of 1,220 meters.

Rolex has never stopped innovating, and doesn’t look like it ever will. The truly special part of this story is you. You can be a part of the past, present, and future of this amazing company by owning a piece of it: a Rolex timepiece. When you wear a Rolex watch, you can observe the precision, feel the status, see the quality, and be ready for your next accomplishment.

Leo Hamel and the watches that Rolex creates have a long history together going back over 35 years. If you are looking to buy a Rolex, sell a Rolex, or repair a Rolex, Leo Hamel’s is your best choice for outstanding service and quality craftsmanship. Leo and his team help our customers to celebrate their accomplishments daily; whether you’re looking for an engagement ring, celebrating an anniversary, or another of life’s significant events, you’ll find it at Leo’s.

Rolex Datejust II

The World’s Largest Diamond – The Cullinan

The Cullinan is the largest gem-quality diamond ever found, measuring in at approximately 4.1 inches in length and 3,106.75 carats, or 1.37 lbs! To put its true size into perspective, it would take 142 separate one-carat diamonds to equal 1 ounce; yet the Cullinan diamond weighs in at almost 22 ounces!

This marvel was discovered in the Premier Mine in South Africa on January 25, 1905 and was then sold to the Transvaal Colony in South Africa, which, at the time, was under British rule. The Transvaal Colony’s plan was to gift the diamond to King Edward VII as a token of loyalty to his throne, and King Edward VII later announced that he would accept the precious gift.


Presently, The Cullinan has been cut into 9 significantly-sized stones, and 96 smaller stones. The largest cut of these 105 rare diamonds is the Cullinan I or the “Great Star of Africa,” which is a 530.2 carat pear shaped diamond that was then set into “The Scepter with the Cross” or the “Royal Scepter.”

Nine Cullinan Diamonds

It is safe to say that the discovery of The Cullinan Diamond is one of the greatest events in the gemological industry, since it is the world’s largest diamond ever discovered!

The Klondike Gold Rush

Gold! Gold! Gold! Newspaper headlines across the US screamed of gold and riches from the Yukon. It was the summer of 1897 and the US was in the middle of an economic recession. Bold-print claims of easy riches filled the imaginations of people across the United States.

Inspired by dreams of gold, people sold all their belongings to head north to the Yukon. Men poured into Seattle and other port cities on the West Coast. Ships, packed with men and supplies, embarked on the great voyage northward. The ships steamed up the Canadian coastline to the Alaskan towns of Skagway and Dyea, and more than 100,000 people made the journey.

Skagway and Dyea became bustling boomtowns as frantic gold seekers prepared for the long trek ahead. In order to cross into the Yukon, people were required by Canadian Authorities to have a one-year’s supply of provisions. A year’s supply usually amounted to over one thousand pounds of food and gear, and would have to be transported 550 miles to the gold fields in Dawson city.

It was winter by the time most people were ready to make the journey up the Chilkoot and White Pass trails. The freezing temperatures, snow, and ice made the journey through the mountains extremely difficult. The going was slow as each man had to make multiple trips back and forth along the trail to bring the required supplies. Some men used horses to help bring supplies up the steep and jagged trail, which caused many of the horses to collapse due to the excessive load. Over 3,000 horses died on one particularly difficult part of the trail, and is now known as Dead Horse Gulch.

The Klondike Gold Rush
Photo Courtesy of PBS

The Chilkoot and White Pass trails are about 35 miles long, but it took the men around three months to pack all their supplies up the trails to the shores of lake Bennet. For some, the visions of gold had begun to fade. Many of the men, discouraged by the difficulties, lost hope and turned back. Some died from exposure to the cold, sickness, starvation and suicide.

Chikoot Trail

For those that did make it up the Chilkoot and White Pass trails, another great challenge was ahead; they had to build boats and travel over 500 miles down the river to the gold fields in Dawson City. When the ice finally melted in spring of 1898, hundreds of boats pushed off to make the journey. The hand-constructed boats were weighed down with men and supplies. Many of the boats capsized or were split open on rocks as they bumped and splashed through rough sections along the river. Men plunged into the icy waters and precious supplies, that had been so difficult to carry up the trails, were destroyed. Many more men lost their lives along the dangerous river passage to Dawson City.

Of the 100,000 people that started the journey, only 30,000 made it all the way to Dawson City, and only a handful of the 30,000 found enough gold to become rich. After months of arduous travel, gold seekers found that most of the gold-rich land around Bonanza Creek had already been claimed. And when the men finally found a place to dig, the work was back-breaking.

Golden Staircase

After clearing the first twelve inches of top-soil, the ground was frozen solid. Men built massive fires in an attempt to thaw the permafrost. Wood had to be cut and hauled to feed the fires. Men shoveled out sludge and chipped through rock. They piled up mounds of dirt and rock that would later be shoveled into sluice boxes. Only occasionally did the sluice box reveal tiny yellow specs of precious metal. After months of toil, all the digging revealed that there was no gold of value to be found; the work was difficult and heart-breaking.

In August of 1898, most of the gold seekers headed home in low spirits. They had spent nearly a year of their lives and perhaps all of their money in hopes of finding gold. While it is easy to look back and discover their folly, it is hard to blame them for taking a chance. They set out with dreams of gold and embarked on the adventure of a lifetime.

End of Summer Savings

As we know, summer in San Diego is almost year round but that didn’t stop us from having the most ah-mazing end of summer deals. From Pre-owned Rolex to vintage Chanel, we have the hottest brands and one-of-a-kind treasures at incredible savings. Most of these items are one-of-a-kind and great deals like these sell quickly, so come on in or shop online today.

Click the links below to check out some of our fav’s!! graphicFrom top to bottom

Left Top : Pre-Owned Hamilton with 2.00 CTW Diamond Bezel

Left Bottom: New 9.01 CTW Sapphire & Diamond Bracelet

Center Top: Vintage Chanel Lucite Logo Pin

Center Middle: Vintage Topaz John Hardy Earrings

Center Bottom: Pre-Owned Rolex GMT-Master

Right Top: Vintage 3.00 CTW Sapphire & Diamond Ring

Right Bottom: New 21.80 Sapphire & Diamond Y Necklace


Introducing Our Newest Jewelry Line — Beverly K.


Since 1999, Beverley K. has been dedicated to crafting exquisite jewelry. They are renowned for beautifully detailed styling and fine craftsmanship. New designs are consistently released, keeping their collection fresh and relevant. Owner Morrie Knopp is passionate about every facet of the business. His commitment to excellence has guided Beverley K. into the fine quality brand it is today.


The collection embodies a graceful femininity and there is nothing else quite like it within the jewelry world. Each design celebrates a perfect harmony of gems and precious metals. From lacy, vintage filigree to elegant, modern expression, they offer a variety of rich textures and finishes in bridal rings, wedding bands and fashion jewelry.


Devotion to Craftsmanship
Everything is made in their own factory and must pass through ten completely different quality control stages to meet their impeccable standards. From start to finish, master jewelers create each individual piece with old world craftsmanship. It is a meticulous process. Every surface is hand polished. All of the diamonds and gems are hand-selected to match flawlessly. Skilled artisans engrave and mill by hand. Everything–from the gliding contours of delicate filigree to the pavé ribbons of sparkling diamonds–is refined to pristine perfection.

Come to Leo’s to see this exciting new collection today!


The King of Gems

July’s birthstone is ruby, known as the “King of Gems” for its gloriously rich red color. It has been used to symbolize royalty and strength since antiquity.


One of the most valuable gems in the world in its finest qualities, ruby can command the highest price-per-carat of any colored stone. The most desirable rubies are a pure, saturated red, and come from the Mogok region of Myanmar. These particular gems are often referred to in the trade as “pigeon’s blood” for their color.

ruby illusion halo

Ruby is the red variety of the mineral corundum, which actually comes in many colors. The blue variety is sapphire, and other colors are known as fancy sapphire. Red corundum gets its color from the mineral chromium, which can actually fluoresce in sunlight causing a fine ruby to appear to glow.



One of the hardest and toughest gems after diamond, ruby is an excellent choice for a daily wear jewelry item such as an engagement ring. Rubies can withstand quite a lot of heat and pressure; you never have to worry about putting a ruby in an ultrasonic cleaner!


If ruby is your gem of choice, don’t worry – you don’t have to break the bank to get a beautiful gem. We have options for every budget!



The Best Engagement Rings in 2015

The Antique-Inspired

This diamond ring embodies the classic look of an antique, but is actually a brand new piece! The old European cut center diamond and milgrain surrounding detail really make this retro ring look and feel like an Art Deco heirloom.

Antique-Inspired Engagement Ring from Leo Hamel

The Heavenly Halo

Make sure you have your sunglasses on while wearing this extra sparkly halo engagement ring from Hearts On Fire! The Hearts On Fire Transcend halo and band are set with 0.46 carats of diamonds and the center diamond is a perfectly cut 1.11 carat Hearts On Fire Dream Diamond.


The Pre-Owned Designer

Why pay full retail price for a designer ring when you can buy a previously owned one at a fraction of the cost? Vintage designer rings are the way to go for price-conscious, eco-friendly shoppers. And seeing a designer piece in-person really helps you realize what kind of craftsmanship is behind a brand like Tacori or Tiffany & Co!


The Stacked Rose Gold 

This rose gold engagement ring can be stacked with two marquise-shaped bands for a delicately beautiful look. Plus, this pink gold looks good on almost every skin tone!

Rose Gold Venetti Engagement Ring

The White & Yellow Gold

White gold engagement rings and jewelry have been the rage lately, but more and more people are starting to incorporate yellow gold into their rings. This Venetti engagement ring has both yellow gold and white gold, which makes it stand the test of time!





Leo Hamel Fine Jewelers is a full-service jewelry store in San Diego and is dedicated to helping customers find their dream diamond engagement ring. Please give us a call at (619) 299-1500 or email us at info@leohamel.com to inquire about a specific jewelry or watch piece that you are interested in.

Why Your Next Watch Should Be a Pre-Owned Rolex

Pre-owned Rolex watches are both TIMELESS and CLASSIC. They are timeless because of the mastery and functionality of the Rolex design, and are classic because they will never go out of style. Rolex watches are still one of the best selling watches of all time and watch connoisseurs always have at least one Rolex in their collection!

These watches are TOUGH!! They are meant to be worn daily and can take a beating. Some of the most beloved Rolex watches were made to perform specific tasks. For example, the Rolex Submariner is a diving watch and is known for its resistance to water and corrosion. The Rolex Daytona is a chronograph used in the racing industry to measure speed. Rolex timepieces are made to withstand years of sunlight, dust, and water submersion. Some people deem the nicks and scratches on their Rolex watches as the battle scars of a trusted companion who has been with them on some of their greatest adventures.

Pre-Owned 18K Gold Rolex Submariner

Rolex watches can hold or increase in VALUE. Like any classic that is crafted with the utmost attention to detail and aesthetics, a vintage Rolex can have incredible value and is a true investment. These perfectly engineered instruments are coveted in the collectors’ world. In fact, a 1942 Rolex Chronograph sold at an auction for 1.16 million in 2011!

Leo Hamel Watch Repair

Modern pre-owned Rolexes are an amazing deal. Since these watches were crafted to be workhorses, they hold up over the years. When refurbished and refinished they can look every bit as sleek and shiny as a new watch. Buying a pre-owned watch will give you that same great look for a fraction of the retail price. Only YOU will know you didn’t pay full retail price.

Rolex Watch Refinish
Before Refinishing and After Refinishing Our Customer’s Rolex Datejust


Come to our San Diego Avenue showroom to see our ever-changing selection of like-new, pre-owned, and vintage Rolex watches, or to get your Swiss or German watch serviced. Servicing your timepiece every 3 to 5 years will allow you to pass your watch down to your children!

If you would like to get your watch refinished to look like new again by our in-house watch repair department, please visit our website or call us at (619) 299-1500.